Carbon pile regulator



W. G. NEILD CARBON PILE REGULATOR Original Filed Sept. 21, 1951 June 8, 1954 IN VEN TOR. W/LL /A M G. NEL/ 0 y M AHORA/Y ,Mu l, l, L M nu: l- Mm im. l K Q man wmf/3 FIG. 1

Reissued June 8, 1954 CARBON PILE REGULATOR William G. Neild, Fair Haven, N. J., assigner to Bendix Aviation Corporation, Eatontown, N. J., a corporation of Delaware Original No. 2,655,581,

Serial No. 247,683, September 21, 1951.

dated October 13, 1953,

Application for reissue March l, 1954, Serial No.

4 claims. (c1. 201-515 Matter enclosed in heavy brackets appears in the original patent but forms no part of this dicates the additions made by reissue.

reissue speciication; matter printed in italics 1n The present invention relates to carbon pile regulators and more particularly to a Contact plug for use in a carbon pile regulator.

In carbon pile regulators, it is often necessary to replace the carbon pile and the contact plugs. Replacement of the carbon pile and contact plug on the fixed or pile screw end of the regulator is comparatively simple by merely removing the pile adjusting screw. Heretofore, it has been necessary to dismantle the unit in order to replace the contact plug on the armature or movable end. Not only is the dismantling complicated, but often serious damage occurs to the regulator coil assembly and other parts in the process of dismantling and reassembly.

The present invention provides a contact plug that may be installed and removed from the armature assembly by merely removing the pile screw, upper contact plug and carbon pile. Thus, the necessity of dismantling the unit to replace the contact plug on the armature assembly is removed. v

An object of the invention is to provide an improved carbon pile regulator.

Another object of the invention is to provide an improved carbon pile regulator in which the contact plugs may be easily replaced.

Another object of the invention is to provide an improved contact plug for a carbon pile regulator.

Another object of the invention is to provide means for replacing the contact plugs of av carbon pile regulator without disassembly oi the unit.

Another object of the invention is to provide a method of replacing contact plugs of a carbon pile regulator without dismantling the unit.

The above and other objects and features of the invention will appear more fully hereinafter from a consideration of the following description taken in connection with the accompanying drawing wherein one embodiment of the invention is illustrated by Way of example.

n the drawing: i

Figure l is a cutaway view of a carbon pile regulator illustrating the invention.

Figure 2 is a cross-sectional view of the regulator of Figure l showing the contact plug and tool for removing the plug.

Figure 3 is a perspective view of the contact plug of Figures l and 2.

Figure 4 is a perspective view of the insert for the contact plug.

Referring now to the drawing, a carbon pile regulator is indicated generally by the numeral 5 and has an electromagnet coil 6; armature assembly 'i and carbon pile 8. A casing 9 encloses the electromagnet coil 6 and supports the armature assembly l. The casing 9 is formed of a suitable ferromagnetic material. A carbon pile housing I0 having heat reducing ins II is secured to the casing 9 by screws I2. A plate I3 is formed integral with the housing IU and fastened thereto by screws I4 is a second plate I5.

The plate I5 is insulated from the plate I3 by a suitable insulating member I6. A cap I1 is secured to the plate I5 by screws I8 and has a threaded portion IB adapted to receive a pile adjusting screw 20.

Mounted in the housing I0 and extending longitudinally therein is a tube 2l of suitable nonconducting material. The tube 2l carries carbon disc 22 forming the carbon pile Contact plugs 23 and 24 are positioned at opposite ends of the carbon pile 8. The contact plug 2,3, not visible in the drawings, is positioned between the pile 8 and the pile adjusting screw 20 and turning the screw 20 adjusts the initial pressure applied to the pile 8.

The contact plug 24, provided`at the opposite end of the pile 8, is mounted in a cup-shaped member 25 formed in an electrical conductor plate 26. The plate 23 is secured to the armature assembly l by screws 2l. The contact plug 24 comprises a ring-like member 28 of carbon or the like and a metal insert 29. The member 28 may have a coating of silver and is proportioned to have a tight fit with the cup-shaped member 25. The metal insert 29 has a threaded portion 3U, the function of which will be explained later.

In order to remove the contact plug 24, without disassembling the unit 5, the screw 2li is removed and the contact plug 23 and carbon pile 3 are withdrawn through the opening in the threaded portion I3 from which the screw 20 was removed. A tool 3l is inserted in the opening with the tube 2I serving as a guide. The tool 3l comprises a cylindrical member 32 having a counterbore portion 33 adapted to fit over the contact plug 24 and an opening 34 extending longitudinally thereof. A rod-like member 35 having a threaded portion 36 on one end thereof is adapted to rit freely in the opening 34. The other end of member 35 terminates in a block 3s and has a cross member 31 extending therefrom. A screw 38 is threaded through the block 36 and is adapted `to force the block 35 away from the member 32.

The counterbore portion 33 of the member 32 fits over the contact plug 24 with the edges of the counterbore portion 33 resting on the cup 25. The rod member is threaded into the threaded portion 30 of the insert 29 and the screw 38 turned in a direction to force the block 36 away from the member 32 thereby pulling the plug 2,4 from the cup 25. The tool 3| is then removed and the plug 24 taken off the member 34.

A new plug 24 may be inserted in the tube 2| and pressed in place by reversing the member 3| and using the ilat portion thereof to press the plug 24 into the cup 25. The carbon pile 8 and Contact plug 2'3 may then be inserted and the screw replaced.

While a set screw 38 has been illustrated as y means for forcing the block 36 and member 3| apart, it is understood that the means could be a cam, lever Yor any other conventional means.

Thus, by providing a contact plug having an insert, replacement of the plug is easily achieved by merely removing the carbon pile adjusting screw and the pile. Heretofore,kit had been necessary to remove the entire armature assembly. This required that the unit be dismantled in order for the amature assembly to be accessible.

Further, providing the contact plug with an insert does not cut down on the contact area as the carbon discs 22 have a hole through the center.

Although only one embodiment of the invention has been illustrated and described, various changes in the form and relative arrangement of the parts which will now appear to those skilled in the art may be made without departing from the scope of the invention.

What is claimed is:

1. A method of removing a contact button from a carbon pile regulator having a carbon pile, a housing, an 'electromagnet including an armature assembly, and a carbon pile adjusting screw; said method comprising removing said adjusting screw, removing said carbon pile through the opening formed by the removal of said screw, inserting a tool through said opening to grip said contact button and applying pressure to said tool while holding said armature assembly against said pressure to remove said contact button.

2. A method for removing a contact button from a cup-shaped holder of an armature assems bly of a carbon pile regulator having a housing, a carbon pile, and a contact screw, said carbon pile being supported between said contact screw and said contact button; said method comprising the steps of removing said contact screw, removing said pile through the opening caused by the removal of said screw, inserting means through said opening to grip said contact button and press against said cup-shaped holder, and applyingpressure to said contact button relative to said cup-shaped holder to remove said button from said holder.

3. A method of replacing a Contact button in a carbon pile regulator having a carbon pile, a housing, an electromagnet including an armature assembly, and a carbon pile adjusting screw; said method comprising removing said adjusting screw, removing said carbon pile through the opening formed by the removal of said screw, inserting a tool through said opening to grip said contact button and applying pressure to said tool while holding said armture assembly against said pressure to remove said contact button, inserting a contact button in said opening, pressing said button into said armature assembly, inserting a carbon pile in saidopening, and replacing said adjusting screw.

4. A method for replacing a Contact button in a cup-shaped holder o9' an armature assembly of a carbon pile regulator having a housing, a carbon pile, and a contact screw, said carbon pile being supported between said contact screw and said contact button; said method comprising the steps of removing said contact screw, removing the pile through the opening caused by the removal of said screw, inserting means through said opening to grip said contact button and press against said cup-shaped holder, applying pressure to said contact button relative to said cupshaped holder to remove said button from said holder, inserting a button in said opening, pressing said button into said cup-shaped holder, inserting a carbon pile in said opening, and replacing said screw.

References Cited in the le of this patent 

